She’s postwar. Boomer by definition. Silent generation is for children raised during the war.
Eta: I looked up the dates and I can see a lot of sources that give the 1946 date so consensus is on your side. I’m old, but the boundary used to be those who were raised during the war vs those who wouldn’t have any memory of it. There is the same argument on the other side as well where late boomers claim to be “Generation Jones” between boomers and X.
Good luck with that.